1. I.N. Uljyanov Chuvash State University, Cheboksary;
Chuvash Republic Cardiological Dispensary, Cheboksary;
Institute for Advanced Medical Education, Cheboksary;
Federal Center for Traumatology, Orthopedics, and Arthroplasty, Cheboksary;
Privolzhsky Research Medical University, Nizhny Novgorod
2. I.N. Uljyanov Chuvash State University, Cheboksary;
Chuvash Republic Cardiological Dispensary, Cheboksary;
Institute for Advanced Medical Education, Cheboksary
3. I.N. Uljyanov Chuvash State University, Cheboksary;
Chuvash Republic Cardiological Dispensary, Cheboksary
4. Chuvash Republic Cardiological Dispensary, Cheboksary
5. I.N. Uljyanov Chuvash State University, Cheboksary
6. Nizhny Novgorod Regional Clinical Antituberculosis Dispensary, Nizhny Novgorod